MD5加密

//最近学习了一个加密的功能：如将用户注册的密码---com.email.util.MD5.encode(密码）----插入数据库，
以后登陆的时候再将输入的密码进行---com.email.util.MD5.encode(密码）----
两次  是否equals   

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package com.email.util;

import java.security.MessageDigest;

public final class MD5 {
public final static String encode(String str) {
StringBuffer buf = new StringBuffer();
try {
MessageDigest md5 = MessageDigest.getInstance("MD5");
md5.update(str.getBytes());
byte[] bytes = md5.digest();
for (int i = 0; i < bytes.length; ++i) {
String s = Integer.toHexString(bytes[i] & 0xFF);
if (s.length() == 1) {
buf.append("0");
}
buf.append(s);
}
} catch (Exception localException) {
}

return buf.toString();
}

// public static void main(String[] args){
// //59be63d0ba659f79b220238ec5db8d4d
// System.out.println(encode("当当1"));
// }

}